A dust removal device for steel production smelting

Abstract

The application discloses a dust removal device for steel production smelting, and belongs to the field of dust removal devices for steel smelting. The dust removal device for steel production smelting comprises two groups of cloth bag filter assemblies, two first three-way pipes connected with air inlet ends of the two groups of cloth bag filter assemblies, two second three-way pipes connected with air outlet ends of the two groups of cloth bag filter assemblies, two screw discharge valves connected with dust exhaust ends of the two groups of cloth bag filter assemblies, and a fixing frame fixedly connected to outer walls of the cloth bag filter assemblies and used for supporting the whole device. The three-way intersection of the first three-way pipe is provided with an air inlet reversing valve, and the three-way intersection of the second three-way pipe is provided with an air outlet reversing valve. The two groups of cloth bag filter assemblies work alternately, one group of cloth bag filter assemblies is used for cleaning dust while the other group of cloth bag filter assemblies is used for continuous filtering, so that the problem that the traditional equipment needs to be stopped and the filter bag needs to be replaced is avoided.

Description

Technical Field

[0001] This application relates to the technical field of dust removal equipment for iron and steel smelting, specifically a dust removal device used in iron and steel production and smelting. Background Technology

[0002] Dust removal equipment in steel smelting is an environmental protection device used in steel production to capture and treat fumes and harmful gases. Its core function is to reduce pollutant emissions, protect the environment and worker health, and improve production efficiency. Currently, steel plants commonly use pulse-jet bag filters for dust removal. The dust concentration generated during steel smelting is extremely high. Generally, a negative pressure device is used to divert the dust, and a cyclone dust collector is used to reduce the concentration of the exhaust gas before it enters the bag filter. This avoids direct impact on the filter bag surface, which could lead to localized perforation or loosening of the fabric, ultimately causing filter bag damage.

[0003] Most dust collectors used in steel plants require shutdown for maintenance, which causes inconvenience and can even affect production. In particular, replacing filter bags requires opening the box and replacing them one by one, which takes a long time. The longer the shutdown, the more likely it is to affect workshop production.

[0004] A Chinese utility model patent with publication number [number missing] has been published. It has been approved. However...

[0005] Therefore, this application provides a dust removal device for steel production and smelting to solve the above-mentioned problems. Utility Model Content

[0006] This application provides a dust removal device for steel production and smelting, which aims to solve the existing problems mentioned in the background art.

[0007] To achieve the above objectives, this application provides the following technical solution: a dust removal device for steel production and smelting, comprising two sets of bag filter assemblies, two first three-way pipes with two outlet ends connected to the air inlet ends of the two sets of bag filter assemblies, two second three-way pipes with two inlet ends connected to the air outlet ends of the two sets of bag filter assemblies, two screw discharge valves with two feed inlets connected to the dust discharge ends of the two sets of bag filter assemblies, and a fixed frame fixedly connected to the outer wall of the bag filter assemblies for supporting the entire device. The first three-way pipe has an inlet reversing valve at the confluence of its three channels, and the second three-way pipe has an outlet reversing valve at the confluence of its three channels. The bag filter assemblies, the inlet reversing valves, and the outlet reversing valves are all connected to an external control system. In this way, the two sets of bag filter assemblies work alternately; while one set is being cleaned, the other set continues filtering, avoiding the problem of traditional equipment requiring complete shutdown for filter bag replacement.

[0008] Preferably, the bag filter assembly includes a filter box fixedly connected to the fixed frame, a clean air discharge pipe fixedly connected to the top side of the filter box and connected to the inlet end of the second three-way pipe via a flange, a dust collection hopper fixedly installed at the bottom of the filter box via a flange, a dust and gas inlet pipe fixedly connected to the side of the dust collection hopper and connected to the outlet end of the first three-way pipe via a flange, a discharge valve fixedly installed at the bottom outlet of the dust collection hopper via a flange, a cage frame fixedly installed in the filter box in a matrix arrangement for bag assembly, and a pulse cleaning mechanism provided on the side of the filter box, wherein the inlet is connected to the outlet end of the discharge valve via a flange.

[0009] Preferably, the pulse cleaning mechanism includes an air tank fixedly connected to the side wall of the filter box and connected to an external high-pressure air pump, a pulse valve connected to the air outlet of the air tank and connected to an external control system, and a blowpipe detachably installed inside the filter box above the cage and connected to the air outlet of the pulse valve. The blowpipe has a nozzle at the bottom that corresponds to the opening at the top of the cage.

[0010] Preferably, one end of the blowpipe near the pulse valve is screwed to the filter box, and the other end is installed on the other side of the filter box by a wing nut and a hexagonal bolt.

[0011] Preferably, the top cover of the filter box is fitted with a cover hinged to the top of the filter box, and a snap-lock is fixedly installed on the side of the top of the filter box near the movable end of the cover.

[0012] Preferably, a perforated plate is fixedly connected inside the filter box at a position corresponding to the lower part of the blow pipe, and the perforated plate has a plurality of positioning holes arranged in a rectangular array for inserting the cage frame.

[0013] Preferably, the flower plate has a protruding ring at the position corresponding to the edge of the positioning hole for folding the opening end of the bag, and the top of the cage frame has a clamping ring for contacting the top of the protruding ring, and the clamping ring is screwed to the outer ring of the protruding ring.

[0014] This dust removal device for steel production and smelting uses two sets of bag filter components that work alternately. While one set is being cleaned, the other set continues to filter, avoiding the problem of traditional equipment requiring a complete shutdown to replace the filter bags.

[0015] This dust removal device for steel production and smelting uses a three-way pipe and reversing valve design, with two sets of bag filters operating alternately. This allows for flexible response to instantaneous changes in flue gas volume during the smelting process, such as during converter blowing and furnace shut-off periods, thus avoiding overload of a single set of equipment.

[0016] This dust removal device for steel production and smelting replaces the retaining rings of the filter bags with a tube sheet convex ring and a pressing ring, which can reduce the cost of purchasing filter bags with retaining rings. In addition, the convex ring and pressing ring are compatible with various sizes of filter bags, reducing the equipment modification costs caused by changes in filter bag specifications. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a dust removal device used in steel production and smelting. Figure 1 ; Figure 2 A schematic diagram of the structure of a dust removal device used in steel production and smelting. Figure 2 ; Figure 3 A schematic diagram of the overall structure of a bag filter assembly in a dust removal device used in steel production and smelting. Figure 4 This is a schematic diagram of the structure of the tube sheet and cage frame of a dust removal device used in steel production and smelting, cut off from the side.

[0018] In the picture: 1. Bag filter assembly; 11. Filter box; 111. Clean air discharge pipe; 112. Box cover; 113. Hook and loop fastener; 114. Perforated plate; 1141. Positioning hole; 1142. Raised ring; 12. Dust collection hopper; 121. Dust inlet pipe; 13. Discharge valve; 14. Cage frame; 141. Compression ring; 15. Pulse cleaning mechanism; 151. Air tank; 152. Pulse valve; 153. Pulse jet pipe; 2. First three-way pipe; 21. Intake reversing valve; 3. Second three-way pipe; 31. Outlet reversing valve; 4. Screw discharge valve; 41. Feed inlet; 5. Fixture. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Example 1 This embodiment provides a dust removal device for steel production and smelting, such as... Figures 1-3As shown, the dust removal device for steel production and smelting includes two sets of bag filter components 1, two first three-way pipes 2 with two outlet ends connected to the air inlet ends of the two sets of bag filter components 1, two second three-way pipes 3 with two inlet ends connected to the air outlet ends of the two sets of bag filter components 1, two screw discharge valves 4 with two feed inlets 41 connected to the dust discharge ends of the two sets of bag filter components 1, and a fixed frame 5 fixedly connected to the outer wall of the bag filter components 1 to support the entire device. The first three-way pipe 2 has an inlet reversing valve 21 at the three-channel intersection, and the second three-way pipe 3 has an outlet reversing valve 31 at the three-channel intersection. The bag filter components 1, the inlet reversing valve 21, and the outlet reversing valve 31 are all connected to an external control system.

[0021] In use, this dust removal device for steel production and smelting achieves continuous dust removal through the alternating operation of two sets of bag filter components 1. Its core logic lies in utilizing the coordinated control of the three-way pipe and the reversing valve, combined with the dust removal function of the screw discharge valve 4, to form a closed-loop system of "filtration-cleaning-dust removal." Specifically, dust-laden flue gas enters the device through the first three-way pipe 2. The inlet reversing valve 21, according to instructions from the external control system, directs the flue gas to one set of bag filter components 1, hereinafter referred to as set A. At this time, the other set, hereinafter referred to as set B, is in standby or cleaning mode. After the flue gas enters set A of bag filter components 1, the dust is intercepted by the filter bags, and the clean gas passes through the filter bags into the second set. The three-way pipe 3 and the outlet reversing valve 31 discharge the purified gas to the subsequent treatment stage. When the dust on the surface of the filter bags of group A accumulates to the set value, the control system triggers the reversing. The inlet reversing valve 21 switches the flue gas to group B, and the outlet reversing valve 31 switches synchronously, so that group B is put into filtration and group A enters the dust removal stage. When group A is being cleaned, external compressed air strips the dust from the surface of the filter bags through the pulse jet or back-blowing system. The dust falls into the feed port 41 of the screw discharge valve 4. The screw rotates and transports the dust to the dust collection device to complete the dust removal. After group B has run for a set time, the system switches back to group A. The two groups of bag filter components 1 work alternately to achieve 24-hour continuous dust removal.

[0022] Specifically, the bag filter assembly 1 includes a filter box 11 fixedly connected to the fixing frame 5, a clean air discharge pipe 111 fixedly connected to the top side of the filter box 11 and connected to the inlet end of the second tee pipe 3 via a flange, a dust collection hopper 12 fixedly installed at the bottom end of the filter box 11 via a flange, a dust gas inlet pipe 121 fixedly connected to the side of the dust collection hopper 12 and connected to the outlet end of the first tee pipe 2 via a flange, a discharge valve 13 fixedly installed at the bottom outlet of the dust collection hopper 12 via a flange, a cage frame 14 fixedly installed in the filter box 11 in a matrix arrangement for bag assembly, and a filter... The pulse cleaning mechanism 15 on the side of the box 11 has an inlet 41 connected to the outlet of the discharge valve 13 via a flange. Dust-laden flue gas enters the dust collection hopper 12 through the dust gas inlet pipe 121, where coarse dust particles are initially settled under gravity. Subsequently, the flue gas rises into the filter box 11 and is filtered by the filter bags fitted on the cage frame 14. Dust is intercepted on the surface of the filter bags, and clean gas is discharged to the second three-way pipe 3 through the clean gas discharge pipe 111. The accumulated dust is periodically discharged to the screw discharge valve 4 through the discharge valve 13 to achieve continuous dust discharge. The components are connected by flanges for easy disassembly and maintenance.

[0023] Specifically, the pulse cleaning mechanism 15 includes an air tank 151 fixedly connected to the side wall of the filter box 11 and connected to an external high-pressure air pump, a pulse valve 152 connected to the air outlet of the air tank 151 and connected to an external control system, and a blowpipe 153 detachably installed above the corresponding cage 14 inside the filter box 11 and connected to the air outlet of the pulse valve 152. The bottom of the blowpipe 153 has a nozzle corresponding to the opening at the top of the cage 14. One end of the blowpipe 153 near the pulse valve 152 is screwed to the filter box 11, and the other end is installed on the other side of the filter box 11 by a wing nut and a hex bolt. The air tank 151 stores high-pressure compressed air. After receiving a signal from the external control system, the pulse valve 152 opens instantly, releasing the high-pressure air in the air tank 151 to the blowpipe 153. One end of the blowpipe 153 is fixed by a screw, and the other end is fastened with a wing nut and a hex bolt. It can be quickly disassembled without tools, which is convenient for cleaning or replacing the nozzle.

[0024] Furthermore, the top of the filter box 11 is covered with a cover 112 that is hinged to the top of the filter box 11. A snap-lock 113 is fixedly installed on the side of the top of the filter box 11 near the movable end of the cover 112. The cover 112 is connected to the top of the filter box 11 by a hinge. When opened, the cage frame 14 and the filter bag can be exposed for easy maintenance or replacement. The snap-lock 113 achieves a seal between the cover 112 and the filter box 11 by mechanical pressing. When closed, the locking tongue of the snap-lock 113 is embedded in the groove on the edge of the cover 112 to form a rigid connection.

[0025] Example 2 Unlike Example 1, traditional filter bags have retaining rings nested at their open ends. During installation, the retaining rings are first secured to the mounting holes, and then the cage is inserted to open the bag. In high-dust environments like steel mills, the filter bags are replaced frequently. These retaining ring bags are more expensive, resulting in higher daily operating costs. Therefore, such as... Figure 4 As shown, a tube sheet 114 is fixedly connected inside the filter box 11 at the position below the blow pipe 153. The tube sheet 114 has a number of positioning holes 1141 arranged in a rectangular array for inserting the cage frame 14. The tube sheet 114 has a protruding ring 1142 at the position corresponding to the edge of the positioning hole 1141 for flipping the opening end of the cloth bag. The top of the cage frame 14 has a clamping ring 141 for contacting the top of the protruding ring 1142. The clamping ring 141 is screwed to the outer ring of the protruding ring 1142.

[0026] In use, the protruding ring 1142 protrudes from the surface of the tube sheet 114. The open end of the filter bag is folded over and fitted onto the outside of the protruding ring 1142, forming the first layer of fixation. The clamping ring 141 at the top of the cage frame 14 is screwed onto the outer ring of the protruding ring 1142 through threads, pressing the open end of the filter bag to form the second layer of seal. The double fixation ensures that there is no leakage at the connection between the filter bag and the tube sheet 114, preventing dust-laden flue gas from being directly discharged around the filter bag.

[0027] By replacing the retaining ring of the cloth bag with the protruding ring 1142 and the pressing ring 141 of the tube sheet 114, the cost of purchasing retaining ring cloth bags can be reduced. Furthermore, the protruding ring 1142 and the pressing ring 141 are compatible with various specifications of cloth bags, reducing the equipment modification costs caused by changes in cloth bag specifications.

[0028] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A dust removal device for steel production and smelting, characterized in that: The device includes two sets of bag filter assemblies (1), two outlets connected to the air inlet ends of the two sets of bag filter assemblies (1), two inlet ends connected to the air outlet ends of the two sets of bag filter assemblies (1), two feed inlets (41) connected to the dust discharge ends of the two sets of bag filter assemblies (1), and a fixed frame (5) fixedly connected to the outer wall of the bag filter assembly (1) to support the entire device. The first three-way pipe (2) has an air inlet reversing valve (21) at the intersection of its three channels, and the second three-way pipe (3) has an air outlet reversing valve (31) at the intersection of its three channels. The bag filter assembly (1), the air inlet reversing valve (21), and the air outlet reversing valve (31) are all connected to an external control system.

2. The dust removal device for steel production and smelting according to claim 1, characterized in that: The bag filter assembly (1) includes a filter box (11) fixedly connected to the fixed frame (5), a clean air discharge pipe (111) fixedly connected to the top side of the filter box (11) and connected to the inlet end of the second three-way pipe (3) through a flange, a dust collection hopper (12) fixedly installed at the bottom end of the filter box (11) through a flange, a dust gas inlet pipe (121) fixedly connected to the side of the dust collection hopper (12) and connected to the outlet end of the first three-way pipe (2) through a flange, a discharge valve (13) fixedly installed at the bottom outlet of the dust collection hopper (12) through a flange, a cage frame (14) fixedly installed in the filter box (11) in a matrix for bag assembly, and a pulse cleaning mechanism (15) provided on the side of the filter box (11), wherein the feed inlet (41) is connected to the outlet end of the discharge valve (13) through a flange.

3. The dust removal device for steel production and smelting according to claim 2, characterized in that: The pulse cleaning mechanism (15) includes an air tank (151) fixedly connected to the side wall of the filter box (11) and connected to an external high-pressure air pump, a pulse valve (152) connected to the air outlet of the air tank (151) and connected to an external control system, and a blowpipe (153) detachably installed inside the filter box (11) above the cage (14) and connected to the air outlet of the pulse valve (152). The blowpipe (153) has a nozzle at the bottom that corresponds to the opening at the top of the cage (14).

4. The dust removal device for steel production and smelting according to claim 3, characterized in that: The blow pipe (153) is screwed to the filter box (11) at one end near the pulse valve (152), and the other end is installed on the other side of the filter box (11) by a wing nut and a hex bolt.

5. The dust removal device for steel production and smelting according to claim 4, characterized in that: The filter box (11) is covered with a cover (112) that is hinged to the top of the filter box (11), and a snap-lock (113) is fixedly installed on the side of the top of the filter box (11) near the movable end of the cover (112).

6. The dust removal device for steel production and smelting according to claim 5, characterized in that: A perforated plate (114) is fixedly connected inside the filter box (11) at a position corresponding to the lower part of the blow pipe (153). The perforated plate (114) has a plurality of positioning holes (1141) arranged in a rectangular array for inserting the cage frame (14).

7. The dust removal device for steel production and smelting according to claim 6, characterized in that: The flower plate (114) has a convex ring (1142) at the position corresponding to the edge of the positioning hole (1141) for folding the opening end of the cloth bag. The top of the cage frame (14) has a pressing ring (141) for contacting the top of the convex ring (1142). The pressing ring (141) is screwed to the outer ring of the convex ring (1142).

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